What is membrane potential and what are the factors which contribute to membrane

Question

What is membrane potential and what are the factors which contribute to membrane potential? Describe the patch clamp technique for determining the ion channel activity Answer question 12-4 in the text book Explain why a Na+ cannot be transported through a K+ channel. What determines the selectivity of the K+ channels Why rate of transport is greater for an ion channel than a transporter' What are the different types of ion channels Explain how a mechanical stimuli allows Venus flytrap to catch its pray Explain how stress-gated ion channels allows us to hear Explain how voltage gated ions channels work in mimosa What is Nernst equation? Explain the terms in Nernst equation. calculate the equilibrium potential of K+ and Na+ using Nernst equation Intracellular concentration (mM) Extracellular concentration (mM)

Explanation / Answer

15. Membrane potential - Potential gradient created across the membrane due to flow of ions from one side of the lipid bilayer to another.

Factors- Concentration of ions across the membrane, Permeability of the membrane, temperature.

24. Nernest equation is relation between potential across the membrane at point of equilibrium with concentration of ions at standard temperature. Equation is -

E = RT/zF [ ln Cout/ Cin], where

R - universal gas constant

z - ion valency

T- temperature

F - Faraday's constant

C - concentration of ions

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